One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(3,7)(9,10)(11,14)(12,19)(13,16)(15,21)(17,24)(18,23)(20,22)(25,26,29,28,30,32,37,36)(27,31,35,34,33,38,40,39)(1,2,4,5)(3,6,7,8)(9,11,13,18)(10,14,16,23)(12,20,21,17)(15,24,19,22)(25,27)(26,31)(28,34)(29,35)(30,33)(32,38)(36,39)(37,40)(9,12,13,21)(10,15,16,19)(11,17,18,20)(14,22,23,24)(27,33)(31,38)(34,39)(35,40)(2,5)(6,8)(10,16)(14,23)(15,19)(22,24)(25,28,29,32,30,36,37,26)(27,34,35,38,33,39,40,31)(1,3,4,7)(2,6,5,8)(27,33)(31,38)(34,39)(35,40)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.